Test the UIF Flag

[HThak.2]

I am newbie getting lost in the HAL functions/features to use. I use STM32CubeMx to generate the code and use Keil uvision5 for development. I use STM32G071 Nucleo-64 development kit.  

I wish to measure a ‘start’ pulse of a proprietary protocol. The pulse, if low for 55 microseconds is considered start pulse.

A port pin has been configured as input. Idea is to poll the line and when a low level is detected, measure the time for how long pulse remains low.

I have used timer 3 with no prescalar, in up counting mode. The ARR count is 3520@64MHz. So far, I have not used any interrupt.

After a low level is detected, the timer is started by

HAL_TIM_Base_Start(&htim3);

As a next step, I wish to poll the UIF flag to check whether the time has elapsed.

I do not know which HAL function or what should I use to check the status of the flag.

Once detected I will need to clear it as well

[HThak.2 · Accepted solution]

I wished to delete the post since I did manage to find the answer but my rights were disabled by administrator.

__HAL_TIM_GET_FLAG(&htim3, TIM_FLAG_UPDATE) - gave me option to poll the flag.

__HAL_TIM_CLEAR_FLAG(&htim3, TIM_FLAG_UPDATE); - clears the flag

Bit silly to ask but I am still learning.

[Imen.D]

Hello @HThak.2​  and welcome to the STM32 Community 🙂

Please don't delete your post, it is better to keep your problem and solution as well.

I marked your answer as Best Answer, as this can be very helpful for Community users to find this solution more quickly.

Imen